Solenoid-magnet.



PATENTED JULY 7, 1903.

.G. T. HANGHBTT. SOLENOID, MAGNET. I APPLICATION FILED IAB. 19, 1901.

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PATENTED JULY 7, 1903..

"G-T. HANCHETT. SOLENOID MAGNET. APPLIOATION FILED MAR. 19, 1901.

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, ATTOHNE UNITED STATES Patented July 7, 1903.

PATENT QFEICE.

GEORGE T. HANOHETT, OF HAOKENSAOK, NEIV JERSEY, ASSIGNOR TO DUDLEY FARRAND, RECEIVER, OF NEWARK, NEW JERSEY.

SOLENOID-MAGNET.

SPECIFICATION forming part of Letters Patent No. 732,851, dated July '7, 1903.

To (0 whom it may concern;

Be it known that I, GEORGE T. HANOHETT, of I-Iackensack, in the county of Bergen and State of New Jersey, have invented certain new and useful Improvements in Solenoid- Magnets, of which the following is a specification. 7

This invention is in the nature of an improved solenoid'magnet more especiallydesigned for use on surface-contact conductor or third-rail electric systems, and it primarily seeks to provide a very simple, stable, and accuratelyoperating means whereby the pulling power of the magnet can be varied and balanced against the reaction power of springs or weights attached to the plunger connected therewith to shift same to its normal or open position.

The invention consists in certain novel features of construction and correlation of parts, all of which will hereinafter be fully described, and particularly pointed out in the appended claim, reference being had to the accompanying drawings, in which- Figure 1 is a vertical section of an ironclad solenoid-1n agnet embodying my improvements. Fig. 2 is a detail view of the upper end of the shell or casing with the adjustingnut. Fig. 3 is a horizontal section taken on the line 3 3 of Fig. 1. Fig. dis a View of the upper plunger-section. Fig. 5 illustratesthe lower plunger member and the contact-carrying bridge attached thereto and actuated thereby. Figs. 6 and 7 are detail views, respectively, of the upper contactcarrying members and the insulating members, hereinafter specifically referred to.

Referring to the accompanying drawings,

in which like letters indicate like parts inall the figures, A designates the inclosing shell, B a cap-plate, which acts as a closure for the lower end of the solenoid, and O indicates a movable plunger which carries the erial No. 51.934. (No model.)

of actuating memberD, it is obvious that any device requiring such motion as would I be imparted by plunger 0 may be attached to and actuated by the plunger 0.

The plunger 0 when the magnet is placed in a vertical position is held to its dropped or open position by gravity, which movement is also aided by the springs E; but when in other than vertical positions said plunger is moved out by spring-pressure alone.

The plunger C is given magnetic force by the inner or high-resistance coils I and outer low-resistance coils O, which are separated from each other-by the sleeves J and M, the inner coil I being wound on a bobbin or sleeve N, in which the upper and lower plungers K and 0 project.

The upper and lower ends'of the coils I and O are protected bythe insulator-plates T and T, as shown.

So far as described it will be apparent that the parts are cooperatively so arranged that when in an operative condition the magnetic circuit is completed by means of the upper plunger K, which is screwed into the shell by the thread K, and it can be locked in any position by the nut F. The adjustability of the member K forms the essential point of this invention for the reason that by making the plunger K adjustable and holding it at its different adjustments the desired mechanical and magnetic results are obtained, which are best explained as follows:

In the action of the device adjusting the plunger member 0 to a position higher than that shown will serve to increase the tension of thesprings E E at such times as the two plungers are in contact by the additional compression'of said springs, and the action of raising the upper plunger-section K, therefore, has the eifect of imparting to the lower plunger 0 a greater tendency to fall, and in this way the mechanical tendency to fall may be readily balanced against the magnetic tendency to lift, or within certain limits any desirable ratio between these two tendencies may be obtained. This feature I have found very valuable in many classes of work. For instance, let it be supposed that it is found desirable to have plunger 0 fall when the magnetizing force of coils O and I reaches a certain value. To do this, the proper current is caused to flow in the coils O and I and the plunger K is screwed upward until a pointis reached Where the plunger 0 just fails to hold. It is obvious, then, that the device will be set so as to allow plunger-section O to fall at all magnetizing forces below this amount.

This type of solenoid finds many useful applications in electromagnetic mechanics, particularly for sectional conductor railwayswitches, where it is often desirable to set the switches to fall open at predetermined minimum current values; but it will be understood that this invention also has a wide application for other kind of work. In its operation the upward movement of plunger K also has an effect on the magnetic pull beside creating mechanical effect due to increased tension on springs E E. This is caused, first, by reason of raising the working air-gap Q away from centerof coil, thereby slightly increasing the magnetic leakage, and, second, by reason of its increasing reluctance of the magnetic circuit, it being plain that the higher adjusting of plunger K the greater the gap-space Q. Therefore the upward movement of the plunger K increases the mechanical reactive effect and diminishes the magnetic tractive effect also, and thereby simultaneously and in two distinct ways causes the desired ratios between the two effects obtained.

Having thus described my invention, What I claim, and desire to secure by Letters Patent, is-

A solenoid-magnet as described, comprising in combination, a casing of magnetic material closed at the top, a cap-plate of magnetic material for closing the bottom thereof, said closed top having a screw-threaded aperture, a short core-piece of magnetic material having a screw-threaded portion for engaging the screw-threaded aperture in the casingtop, said core-piece being adapted for longitudinal adjustment, said cap-plate having an aperture therefor in alinement with the apertu re in the top of the casing; a movable flange adapted for longitudinal movement in said cap-aperture and said casing, said flange haviug an extension projected out of the casing and provided with contact-carrying arms at its lower end, a solenoid winding within said casing surrounding said flange and adjustable core, for magnetizing the same, a supplemental winding surrounding the other winding and connected in series with the contact-carrying arms, when the flange is in its drawn-up position, substantially as shown and described.

GEORGE T. l'IANCIIE'lT.

Witnesses:

F; W. BARKER, CHAS. S. LONGHURST. 

